Translated German comments

I've tried to translate them as faithfully as possible. Some of them really
don't seem to make any sense at all. There are quite some incomplete sentences,
and they are sloppily put together in general.

Change-Id: I3d215343de4d3b33a609f3dc52e8cfa7cd8c1d67
Reviewed-on: https://gerrit.libreoffice.org/7599
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>